A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

The sophisticated hydraulic system of the Nazca civilization.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This enormous spiral sculpture looks strangely out of place on the edge of a housing development.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The ritual has been performed uninterrupted for nearly 700 years.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Fast food feels like fine dining at this award-winning modern Georgian building.

A charmingly unusual prefabricated metal church designed by Alexandre Gustave Eiffel.

This abandoned nitrate town was repurposed as a dictator's prison.

This bright yellow bridge is a true engineering feat.

Walk on a glass floor suspended over ancient mummified remains.

Pivotal home of Nobel Prize winner Pablo Neruda.

The ruins of a grand theater destroyed during the most powerful seismic catastrophe ever recorded.

The ruins of a pre-Columbian fortress city so secure it held off the Spanish conquistadors for over 20 years.

You can swim in these highly salty, mesmerizingly blue lakes in the Atacama Desert.

The ominously named cave is home to some remarkable ancient art.